What defines transformer oil quality?

Transformer oil quality is defined by several key parameters, including its dielectric strength, moisture content, acidity, and dissolved gas analysis (DGA). High dielectric strength indicates better insulation properties, while low moisture content prevents electrical breakdown. Acidity levels must be minimal to avoid corrosion, and DGA helps detect potential faults. Regular testing of these factors ensures the reliability and longevity of power transformers, maintaining optimal performance and safety.